Dreamcatcher tells of four young friends who perform a heroic act -- and are changed forever by the uncanny powers they gain in return. Years later the friends, now men, are on a hunting trip in the Maine woods when they are overtaken by a blizzard in which something much more ominous moves. Challenged to stop an alien force, the friends must first prevent the slaughter of innocent civilians by a military vigilante, then overcome a threat to the bond between them.